According to the article about Mt. Pinatubo's eruption, what caused thousands of roofs to collapse? A. The eruption triggered an earthquake, which caused roofs to collapse. B. The violent shaking of the eruption caused roofs to collapse. C. The ash mixed with the typhoon's rain became too heavy for roofs to support. D. The eruption spewed out large rocks, which landed on roofs and caused them to collapse.

C. The ash mixed with the typhoon's rain became too heavy for roofs to support.

Explanation:

In the article, the eruption caused an ash cloud to be formed which mixed with the droplets from the rain. When the watery ash fell on roofs, its weight was to heavy to be supported by the roofs, thus the roofs started collapsing. Thousands of roofs collapsed due to this effect.

Therefore, the appropriate answer is: the ash mixed with the typhoon's rain became heavy for roofs to support.

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